title: Early loosening of a press-fit cup with ceramic-on-ceramic articulation: our early results.
abstract: BACKGROUND
  In this study, we present the short-term results of the Selexys TH+ cup with the Ceramys inlay which is a press-fit cup with a ceramic-on-ceramic articulation. (Mathys, Bettlach, Switzerland). We compared the results with a retrospective-matched control group with a Delta PF cup (Lima, Udine, Italy), which is also a press-fit cup with a ceramic-on-ceramic articulation.
  
  
  METHODS
  257 elective hip arthroplasties with the Selexys TH+ cup in 250 patients placed in 2009 and 2010 were analyzed and compared with a control group retrospective analysis of the uncemented Delta PF cup (Lima, Udine, Italy) placed in 2007 and 2008 in 208 patients (222 hips). Surgical technique and surgeons were identical in both groups.
  
  
  RESULTS
  During a follow-up period of 3-21 months, 19 aseptic loosenings (7.4 %) were found for the Selexys TH+ cup. The survival plotted by a Kaplan-Meier curve shows a 1-year survival of 87.4 %. The Lima Delta PF cup showed a 1-year survival of 99.5 %. Failure analysis showed no clear explanation for this early loosening.
  
  
  CONCLUSIONS
  The Selexys TH+ cup combined with the Ceramys ceramic-on-ceramic inlay coupling show an unacceptable high early revision rate. Therefore, we advice against using this combination.
authors.affiliation: Department of Orthopedic Surgery, Slotervaart Hospital, Amsterdam, The Netherlands, D.Haverkamp@osteotomie.nl.
authors.forename: Daniël
authors.initials: D
authors.lastname: Haverkamp
authors.forename: Stijn
authors.initials: S
authors.lastname: Westerbos
authors.forename: Martin M
authors.initials: MM
authors.lastname: Campo
authors.forename: Ritsert H
authors.initials: RH
authors.lastname: Boonstra
authors.forename: G H
authors.initials: GH
authors.lastname: Rob Albers
authors.forename: Harm M
authors.initials: HM
authors.lastname: van der Vis
mesh_terms: D000077:Acetabulum / Q000601:surgery; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001672:Biocompatible Materials; D002516:Ceramics; D019544:Equipment Failure Analysis; D005260:Female; D006621:Hip Joint / Q000601:surgery*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D007592:Joint Diseases / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D001672:Biocompatible Materials